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In III A group Tl (thallium) shows +1 Oxidation state while other members show +3 oxidation state. Why?

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In III A group Tl (thallium) shows +1 Oxidation state while other members show +3 oxidation state. Why?

(A)  Presence of lone pair of electron in Tl.

(B)  Inert pair effect

(C)  Large Ionic redius of Tl ion

(D)  None

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Best answer

Correct option  (B) Inert pair effect

Explanation:

Inert pair effect become significant for 6th & 7th period of p- block element.

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